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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, a[1030], b[1030], dp[1030][1030];
void citire()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>a[i];
for(int i=1; i<=m; i++)
fin>>b[i];
}
int maxim(int a, int b, int c)
{
if(a>=b && a>=c)
return a;
else if(b>=a && b>=c)
return b;
return c;
}
void subsir()
{
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=maxim(dp[i-1][j], dp[i][j-1], dp[i-1][j-1]);
fout<<dp[n][m]<<"\n";
}
void afisare(int i, int j)
{
if(dp[i][j]==0)
return;
if(a[i]==b[j])
{
afisare(i-1, j-1);
fout<<a[i]<<" ";
}
else if(maxim(dp[i-1][j], dp[i][j-1], dp[i-1][j-1])==dp[i-1][j-1])
afisare(i-1, j-1);
else if(maxim(dp[i-1][j], dp[i][j-1], dp[i-1][j-1])==dp[i-1][j])
afisare(i-1, j);
else
afisare(i, j-1);
}
int main()
{
citire();
subsir();
afisare(n, m);
return 0;
}